Pen



FIG. 1 is an upper front left perspective view of a pen showing my newdesign;

FIG. 2 is a left side elevation view thereof, with the right sideelevation view being a mirror image of the left side elevation view;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is an enlarged top plan view thereof; and,

FIG. 6 is an enlarged bottom plan view thereof.

The broken lines shown on the top of the pen in FIGS. 1, 3, and 5illustrate environment and form no part of the claimed design.

The ornamental design for a pen, as shown and described.